Too Many Notebooks?

Hello friends! I’m visiting my parents house in the states and I came across my first traveler’s notebook. My first notebook was a regular brown (original midori) back in 2014. Once I received my Narita edition brown traveler’s notebook, I gave the other notebook to my sister. It turns out she has not been using that one and has been using a different traveler’s notebook. I decided to move into it with some inserts that I had with me.

It’s much darker than my Narita edition TN (maybe due to lack of use…) and it’s also a bit stiff. Maybe I’m using too many notebooks… How many notebooks is too many notebooks? Olive edition traveler’s notebook is STILL my everyday carry (notes, planner, personal journal – things I don’t post).